Todd Rice is the son of Alan Scott, the original Green Lantern, and Rose Forest, the original Thorn. Forest married Scott under an assumed name,but left him, in fear that her criminal Thorn personality would take control of her and kill him. She bore twin children, but abandoned them, fearing her Thorn persona might kill them as well. The twins, who became known as Todd Rice and Jennie-Lynn Hayden, were each raised by a different set of foster parents in the Milwaukee area. When they reached their late teens, each twin developed super powers, including a limited telepathic link. Using this link, Jennie-Lynn managed to find her brother, and the two spent the next few weeks training together in the use of their powers. 

Due to Jennie-Lynn's power-pulse abilities, the twins suspected that their biological father might be the original Green Lantern. Creating costumes for themselves, they took the identities Jade and Obsidian, and confronted him at a Justice Society meeting. This meeting happened to be the same one that several other offspring and proteges of the JSA had decided to crash, in order to gain admittance. Jade and Obsidian attempted to join as well, but all the young heroes were turned away due to their lack of experience. 

Eventually, these heroes banded together under former JSA member, the Star-Spangled Kid, to form Infinity, Inc. During their time with Infinity Inc., Obsidian and Jade learned from Green Lantern's old enemy, the Harlequin, that they were indeed the children of Alan Scott. The Infinitors operated on the west coast for a few years, until the death of Star-Spangled Kid (by then, calling himself Skyman) broke up the group.

For a time, Obsidian accompanied his sister as she attempted to further her acting career in Hollywood, but eventually tired of playing tag-along. With his fellow Infinitor, Nuklon, he petitioned the Justice League for membership during one of their restructuring periods. They were accepted, and served with the Justice League until its recent return to an "exclusive" membership of Earth's most powerful heroes. 

Powers/Abilities: 
Obsidian can become a living, two-dimensional shadow. In this form, he can glide along walls and ceilings, distorting his form like a shadow. He can pass through solid objects, and float through air. When he envelops others with his shadow form, he can force them to see the an "inner horror", which leaves them partially traumatized. Obsidian has a telepathic link with his twin sister, Jade. Bright flashes of light cause him pain while he is in his shadow form. He is still an unskilled hand-to-hand combatant, relying primarily on his shadow powers.